TFT-LCD Pixel Structure with Dual Active Switches for Extended Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for higher resolution and refresh frequency in TFT-LCD devices results in shorter pixel charging times, leading to a reduced pixel charging rate, which negatively impacts the display effect.
Innovation Solution
A pixel structure comprising scan lines and data lines forming a matrix of pixel areas, with each pixel area including a first active switch connected to a scan line and a data line, and a second active switch connected to a reference voltage, allowing for extended charging time by discharging pixels in one row while charging the next row.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resolution and refresh frequency of TFT-LCD devices are increased, then the display quality is improved, but the pixel charging time becomes shorter and the pixel charging rate decreases
Solution Approach 1:
The patent divides the pixel circuit into two separate active switches: a first active switch for charging the pixel electrode through the data line, and a second active switch for discharging the pixel electrode to a reference voltage. This segmentation allows independent control of charging and discharging operations, enabling the charging process to be extended across multiple scan cycles while the discharging occurs during the scan of the next row, thereby resolving the contradiction between high resolution/refresh rate requirements and sufficient pixel charging time
Solution Approach 2:
The second active switch performs preliminary discharging of the pixel electrode connected to the next row during the scan period of the current row. This preliminary action prepares the next row's pixel for subsequent charging operations, effectively utilizing the scan time of one row to perform preparatory work for the next row, thereby extending the effective charging time without increasing the overall refresh cycle time
Data Source
AI summary
Disclosed are a pixel structure, an LCD panel and an LCD device. The pixel structure includes scan lines and data lines perpendicularly intersected with each other to form pixel areas in a matrix form. Each pixel area includes a pixel electrode, a first active switch and a second active switch. A gate of the first active switch and a gate of the second active switch are connected to the corresponding scan line, and a drain of the first active switch is connected to the corresponding data line, and a source of the first active switch is connected to the corresponding pixel electrode. A drain of the second active switch is connected to a reference voltage, and a source of the second active switch is connected to the pixel electrode of the next row and disposed together with the corresponding pixel electrode at the pixel electrode of the same column.